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KSCE Journal of Civil Engineering

, Volume 23, Issue 5, pp 2009–2016 | Cite as

Field Load Testing Study of Vertical Bearing Behavior of a Large Diameter Belled Cast-in-Place Pile

  • Guangyun Gao
  • Meng GaoEmail author
  • Qingsheng Chen
  • Jun Yang
Geotechnical Engineering
  • 53 Downloads

Abstract

To investigate the vertical bearing behavior of manually excavated large diameter belled concrete piles (LDBCPs), field loading tests were performed on a total of 16 LDBCPs, ranging from 0.8 to 3.5 m in base diameter from 6.1 to 18.0 m in embedment length. The end bearing stratum is sand and gravel. The influence of pile dimensions (i.e., size of enlarged base D, embedment length L, and length-to-diameter ratio L/D) on the vertical bearing behavior of a belled pile is presented and discussed. Comparison is also made of the vertical bearing behavior of a belled pile and of a conventional straight pile under otherwise similar conditions. The results indicate that: 1) The vertical bearing capacity of a belled pile is significantly greater than that of a conventional straight pile provided the debris at the bottom of a belled pile is properly removed; 2) over 65% of the vertical bearing capacity for a belled pile is attributed to the tip resistance (Qe); 3) compared to the contribution of pile length L, increasing enlarged base D is a more effective way to increase the vertical ultimate bearing capacity of a belled pile (Qu); 4) the optimum length-to-enlarged base ratio (L/D) for belled piles to achieve maximum vertical bearing capacity is around 3.2.

Keywords

large diameter belled pile a conventional straight pile field load test vertical ultimate bearing capacity tip resistance length-to-enlarged base ratio manually drilled hole 

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Copyright information

© Korean Society of Civil Engineers 2019

Authors and Affiliations

  • Guangyun Gao
    • 1
  • Meng Gao
    • 2
    Email author
  • Qingsheng Chen
    • 3
  • Jun Yang
    • 4
  1. 1.Key Laboratory of Geotechnical and Underground Engineering of Ministry of EducationTongji UniversityShanghaiChina
  2. 2.Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation (college of Civil Engineering and Architecture)Shandong University of Science and TechnologyQingdaoChina
  3. 3.Dept. of Civil and Environmental EngineeringNational University of SingaporeSingaporeSingapore
  4. 4.Dept. of Civil EngineeringUniversity of Hong KongPokfulam, Hong KongChina

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